#include <iostream>
#include <stack>
#include <string>
using namespace std;
int main()
{
    int T, n;
    string a, b;
    cin >> T;
    while(T--) {
        cin >> n;
        cin >> a >> b;
        for(int i = 0; i < n; ++i) {
            if (a[i]=='A') a[i] = 'U';
            else if(a[i]=='C') a[i] = 'G';
            else if(a[i]=='G') a[i] = 'C';
            else if(a[i]=='T') a[i] = 'A';
        }
        if (a==b) cout << "YES" << endl;
        else cout << "NO" << endl;
    }
    return 0;
}